<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		body {
			height: 3000px;
			background-image: url(images/sms.jpg);
			background-repeat: no-repeat;
			/*这种写法一般是我们以后 超大背景图片的做法 背景定位*/
			background-position: center top;
		}
	</style>
</head>
<body>
	
</body>
</html>